Shaking-grate.



E. c. HAFER.

Patented Feb. 4, 1919.

EDWARD C. I-IAFER, 0F CHAI'IIBERSBURG, PENNSYLVANIA.

SHAKING-GRATE.

eeann.

Specification of Letters Patent.

Pat-er ted lFeb. 4t, 1919.

Application filed January 6, 1917. Serial No. 140,964.

To all whom it may concern:

Be it known that I, EDWARD 0. Hanna, a citizen of the United States,residing at Chambersburg, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Improvements inSliakingGratcs; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in furnaces of the rocking oroscillating bar type, and pertains more particularly to the constructionof bars, method of mounting thereof, and manner of support of the grate.

An object in view is the eiiective avoidance of interference betweenbars and the prevention of danger of dislocation of any of the bars byanchoring certain of such bars.

A further object is the protection of the grate carriage, and anadditional object is the adaptation of the grate for assuming variouselevations.

With these and further objects in view, as will in part hereinafterbecome apparent and in part be stated, the invention comprises certainnovel constructions, combinations and arrangements of parts assubsequently specified and claimed.

In the accompanying drawings,

Figure l is a perspective view of a grate embodying the features of thepresent invention.

Fig. 2 is a fragmentary, vertical section taken approximately on theplane indicated by line 2? of Fig. 1.

Fig. 3 is a similar view of a lied embodiment.

Fig. 4 is a fragmentary, vertical section taken vertically through oneof the supporting legs of the grate.

Referring to the drawing by numerals, 1 indicates the furnace frontprovided with the usual lever mechanism 2 connected by links 3 and 4with operating levers 5 for rocking the grate bars 6, 6. Each of thegrate bars 6 is formed between its end portions 6 and the main body ofthe bar with a cylindrical portion or journal 7 finding bearing in anupstanding portion 8 of the grate carriage 9, there being, of course,two grate carriages 9, although one is obscured in the drawing by thepresence of the grate bars. Each carriage 9 is provided with an slightlymodiupwardly extending portion 8 for each grate bar, and some of said unvardly extending portions are provided with vertical recesses ofrelatively shallow depth for forming a bearing for the journal 7, asindicated in llig. 2. Other of said upwardly extending portions 8 areprovided with considerably deeper notches, as indicated at 10 in Fig. l,for forming the bearing for the journal 7 of the respective grate bar,the said journal 7 in; that instance being formed at a lower portion ofthe respective bar 6 than in the instance seen in. Fig. 2, and forconvenience of reference the arrangement of journal 7 seen in Fig. 2will be referred to as upper while that seen in the notch 10 will bereferred to as lower.

It is preferable to provide upper and lower journals alternating so asto permit proper clearance, and the desired rocking of the bars duringactuation by the lever mechanism The depth of the lower journals in thecarriage is such that there is practically no liability of the barshaving such journals becoming dislocated, but difficulty has beenexperienced with the bars having the uppenjournals from such barsbecoming dislocated, and to avoid this difficulty, I employ a U-shapedstrap 11 for each of the upper journals, the strap being riveted orotherwise appropriately fixed at its ends to the upstanding portions 8of the carriage and extending over the respective journal 7 between theplane of the outer face of the carriage 9 and the inner edge of theportion 6 of the respective bar. These straps may also be employed onthe lower journals, if desired, but usually retention of the upperjournals is ample for assuring maintenance of the grate bars in properoperative position.

In Fig. 3 is seen an instance of the U- shaped strap 11 retaining thelower journal in position in its bearing in carriage 9.

Each grate bar 6 has its upper edge tapered and protected by a series oflaterally spaced fuel-sustaining segments or leaves 12, each havinglateral lugs 13 spacing it from its next adjacent leaf throughout thelength of the bar except at the ends. At each end of each bar isarranged a leaf 14: which differs from the leaves 12 in that each leaf12 consists of a bifurcated plate having its legs extending on oppositesides of the grate bar and being held in position thereby, whereas theleaf 1% consists of two such 1 9 with serratlons plates spaced apart andconnected by an intervening Web 1 1 formed with a flanged portion 14:corresponding in contour. to the upper portion of any one of the leaves12. The space spanned by the web 1 1 is sufiicient for accommodating thecarriage 9 height of a grate after the grate has been delivered, andwith the ordinary grate the labor of reducing the height is almostprohibitive and the result of an effort to elevate the grate is seldomsatisfactory. To make possible the adjustment of the height of the gratewith a minimum amount of labor and in a satisfactory and workmanlikemanner, I have provided the legs 15 of the carriage 16 in their outerfaces engaged by serrations 17 in the inner faces of adjusting blocks18, the blocks 18 be ing held in position by bolts 19, 19, passedthrough slots 20, 20, formed in the respec- Gopies of this patent may beobtained for five cents each, by addressing the tive legs 15 and blocks18. Thus when it becomes necessary to lower the grate, it is alsonecessary to loosen the bolts 19, shift the blocks 18 upward, and againtighten the bolts. A. reverse operation is all that is necessary forelevating the grate.

What I claim is The combination with a grate carriage, of a grate barhaving a journal adjacent its end, and an end portion outside of thejournal, the journal finding a bearing in the carriage with the endportion spaced out- Ward from the carriage, retaining means engaging thejournal and carriage, and a protecting fuel-sustaining leaf mounted onthe grate bar and of suiiicient area longitudinally of the bar to extendfrom the plane of the inside face of the carriage to the outer extremityof the bar for spanning the journal and its retaining means and havinglegs pendent on the opposite e sides of the bar at both sides of thecarriage.

In testimony whereof I afiix my signature in presence of twowitnesses.

EDWARD G. HAFER. Witnesses:

EDGAR M. KITOHIN,

O. H. FESLER.

Commissioner of Patents,

Washington, D. C.

